NAT I Engineering Chemistry With Answers

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NAT I Engineering Chemistry

Sr. # Questions Answers Choice
1 When electricity is passed through molten AI2O3 + Na3AIF6 and 13.5 gms AI are deposited,the number of faraday must be 0.5 1.0 1.5 2.0
2 The reference calomel electrode is made from which of the following? ZnCI<sub>2</sub> CuSO<sub>4</sub> Hg<sub>2</sub>CI<sub>2</sub> HgCI<sub>2</sub>
3 If a salt bridge is removed between the two half cells the voltage Drops to zero Does not change Increases gradually Increases rapidly
4 When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to One gm. atomic weight One gm. Equivalent weight Electrochemical equivalent None of the above
5 Which of the substances Na, Hg, S Pt and graphic can be used as electrodes in electrolytic cells having aqueous solution? Na,Pt and graphite Na and Hg Pt and graphite only Na and S only
6 Which is not a colligative property? Osmotic pressure Lowering of vapour pressure Depression of freezing point Elevation of boiling point
7 The molal elevation constant is the ratio of the elevation in boiling point to Molarity Molality Mole fraction of solute Mole fraction of solvent
8 Which inorganic precipitate acts as semipermeable membrane? Calcium sulphate Barium oxalate Nickel phosphate Copper ferrocyanide
9 The movement of solvent molecules through a semipermeable membrane is called Electrolysis Electrophoresis Osmosis Cataphoresis
10 Saturated solution of NaCI on heating becomes Super saturated Unsaturated Remains saturated None
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